Sirumalai (Tamil: சிறுமலை) is a region of 60,000 acres (200 km2) situated 25 km (16 mi) from Dindigul and 90 km (56 mi) from Madurai,Tamil Nadu, India. There are many high hills in the area.[1][2][3][4] Hillock International School is located in Sirumalai.[5]
Sirumalai is a dense forest region with a moderate climate throughout the year. With an altitude of 1600 metres above sea level, it contains diversified flora and fauna. The hill has 18 hairpin bends. On the 18th bend is a church and a view point of Dindigul city and the "Dindigul Rock Fort". The hill contains a small waterfall as well. The famous Sirumalai banana is slowly disappearing from disease, which scientists have been unable to prevent.[6]

Man-made fires on the hills have destroyed medicinal plants and threatened the fauna habitat. Fires are often set to promote vegetation growth used for animal fodder, clear land for cultivation, or improve access to timber.[7]

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Mathamalai Annai Veilankanni Church is situated on top of one of the hills. Residents observe the festival for "Our Lady Of Good Health" annually in September, with a flag hoisted prior to the festival.

Sirumalai Lake contains a small lake that was artificially created in the year 2010.[citation needed]

In the region of sirumalai the Agasthiarpuram is a holy place where siddas (monks) have lived since ancient days. The area is surrounded with medicinal herbs and plants. At the top of the hill there is historic Shiva Lingam, which dates back at least 500 years.

The famous Lord Murugan temple (Vellimalai Murugan Temple) is located in the mountain which is away from 45 minutes climbing over the valley.

Much of the Sirumalai is covered by deciduous forests - the lower slopes by dry deciduous and the higher slopes and riverine valleys by moist and wet deciduous forests. Trees such as Terminalia , Shorea , Magnolia champaca are dominant in these hills. Other rare plants such as Lianas and Orchids also occur in the higher elevation evergreen tracts. Coffee estates form a major portion of present-day landscape. These Reserve Forests are protected under Tamil Nadu Forest Department.

Located in Sirumalai is Agathya Puram. Named after the prominent AgathyaSiddhar. Located in Agathya Puram is Silver Hill, this is the tallest hill in Sirumalai. It is said that the peak of the Silver hill was made up of Silver but to avoid man's destruective actions during the Kali Yuga the hill was transformed via Alchemy in to stone by Agathya Siddhar, hence it got the name silver hill. The hills silver glitter can be still seen in the sun light. In the peak of this Silver hill is a 500-year-old ShivaLingam, walk to top of the hill is about 30 – 45 minutes.The view from the silver Hill is breathtaking.

Agatthiyar SivaSakthi Sitthar peedam is an ashram located at the silver hill in Agathya Puram. Food is served daily (Annadanam), lodging is available at the ashram.The ashram aims to promote various voluntary campaigns such as cleaning of the hills.